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1. A method of setting a black voltage of a display panel comprising a first pixel of a first color, a second pixel of a second color, and a third pixel of a third color, the method comprising: applying a test voltage to the display panel; measuring a luminance and color area of a test image displayed in the display panel; and individually obtaining a black voltage of each of the first to third pixels based on the luminance and the color area; wherein the measuring of the luminance and the color area of the test image comprises, when the luminance exceeds a preset reference luminance, measuring a color area of the display panel.
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